Pragmatics of interrogtaives

[Philip Dale]

Assuming that the primary goal is to comparison performance of the various
age groups (and perhaps gender within age group), it can be useful to think
about cell size. If one-year age grouping is proposed, and gender within
age, for 3-7 year olds that would be 10 cells. To estimate means and
variances, a very rough rule of thumb would be about 25-30 subjects per
cell, or 250-300 total. More would be needed if the primary goal was to
identify low-performers, because then you're not just estimating the mean,
but values for extreme cutoffs (lowest 10%, say).
 
But I am absolutely mystified why an ethics committee should ask you to
change the age range of the study. That doesn't seem any of their business.
 
Philip S. Dale, Professor and Chair
Speech & Hearing Sciences
University of New Mexico 

  _____  

From: info-childes at googlegroups.com [mailto:info-childes at googlegroups.com]
On Behalf Of Vaidyanathan Raghunathan
Sent: Monday, June 13, 2011 7:44 AM
To: info-childes at googlegroups.com
Subject: Pragmatics of interrogtaives


Hi everyone,
 
One of my Ph.D student, reenctly, has to  face a problem before the ethics
committe of the Institution. She is planning to do her research on the
Understanding the pragmatic functions in Tamil Children in then age range of
3-9. She has formulated 25 test questions and has plans to admisnster them
to nearly 180 children But the ethics committee expects her to raduce the
range to 3-7 and adminster the test on 450 children.
 
I personally feel the number is on the higher side and can be reduced. Will
the members be kind enough to give their opinion as to the number of
children needs to be studied to have valid and reliable result of the
comprhension of the pragmatic function of Interrogatives?
 
Prof. Vaidyanathan
.
 

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